#include <iostream>
#include <stdio.h>

using namespace std;

int main() {
    double a,b;
    char c;
    cin >> a >> b >> c;
    if(c == '+'){
        cout << a + b;
    }
    else if (c == '-'){
        cout << a-b;
    }
    else if(c == '*'){
        cout << a * b;
    }
    else if(c == '/'){
        if(b != 0){
        cout << a / b;
        }
        else{
            cout << "Divided by zero!";
        }
    }
    else{
        cout << "Invalid operator!";
    }
    return 0;
}